Package org.gradle.api.artifacts

## Interface ResolutionStrategy

-     public interface ResolutionStrategy

  Defines the strategies around dependency resolution. For example, forcing certain dependency versions, substitutions, conflict resolutions or snapshot timeouts.

  Examples:

       plugins {
           id 'java' // so that there are some configurations
       }

       configurations.all {
         resolutionStrategy {
           // fail eagerly on version conflict (includes transitive dependencies)
           // e.g. multiple different versions of the same dependency (group and name are equal)
           failOnVersionConflict()

           // prefer modules that are part of this build (multi-project or composite build) over external modules
           preferProjectModules()

           // force certain versions of dependencies (including transitive)
           //  *append new forced modules:
           force 'asm:asm-all:3.3.1', 'commons-io:commons-io:1.4'
           //  *replace existing forced modules with new ones:
           forcedModules = ['asm:asm-all:3.3.1']

           // add dependency substitution rules
           dependencySubstitution {
             substitute module('org.gradle:api') with project(':api')
             substitute project(':util') with module('org.gradle:util:3.0')
           }

           // cache dynamic versions for 10 minutes
           cacheDynamicVersionsFor 10*60, 'seconds'
           // don't cache changing modules at all
           cacheChangingModulesFor 0, 'seconds'
         }
       }

  Since:
    1.0-milestone-6

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Interface | Description
    --- | --- | ---
    `static class` | `ResolutionStrategy.SortOrder` | Defines the sort order for components and artifacts produced by the configuration.

  - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `ResolutionStrategy` | `activateDependencyLocking()` | Activates dependency locking support in Gradle.
    `void` | `cacheChangingModulesFor​(int value, String units)` | Sets the length of time that changing modules will be cached, with units expressed as a String.
    `void` | `cacheChangingModulesFor​(int value, TimeUnit units)` | Sets the length of time that changing modules will be cached.
    `void` | `cacheDynamicVersionsFor​(int value, String units)` | Sets the length of time that dynamic versions will be cached, with units expressed as a String.
    `void` | `cacheDynamicVersionsFor​(int value, TimeUnit units)` | Sets the length of time that dynamic versions will be cached.
    `ResolutionStrategy` | `capabilitiesResolution​(Action<? super CapabilitiesResolution> action)` | Configures the capabilities resolution strategy.
    `ResolutionStrategy` | `componentSelection​(Action<? super ComponentSelectionRules> action)` | The componentSelection block provides rules to filter or blacklist certain components from appearing in the resolution result.
    `ResolutionStrategy` | `deactivateDependencyLocking()` | Deactivates dependency locking support in Gradle.
    `ResolutionStrategy` | `dependencySubstitution​(Action<? super DependencySubstitutions> action)` | Configures the set of dependency substitution rules for this configuration.
    `ResolutionStrategy` | `disableDependencyVerification()` | Deactivates dependency verification for this configuration.
    `ResolutionStrategy` | `eachDependency​(Action<? super DependencyResolveDetails> rule)` | Adds a dependency substitution rule that is triggered for every dependency (including transitive) when the configuration is being resolved.
    `ResolutionStrategy` | `enableDependencyVerification()` | Enabled dependency verification for this configuration.
    `ResolutionStrategy` | `failOnChangingVersions()` | If this method is called, Gradle will make sure that no changing version participates in resolution.
    `ResolutionStrategy` | `failOnDynamicVersions()` | If this method is called, Gradle will make sure that no dynamic version was used in the resulting dependency graph.
    `ResolutionStrategy` | `failOnNonReproducibleResolution()` | Configures Gradle to fail the build is the resolution result is expected to be unstable, that is to say that it includes dynamic versions or changing versions and therefore the result may change depending on when the build is executed.
    `ResolutionStrategy` | `failOnVersionConflict()` | In case of conflict, Gradle by default uses the newest of conflicting versions.
    `ResolutionStrategy` | `force​(Object... moduleVersionSelectorNotations)` | Allows forcing certain versions of dependencies, including transitive dependencies.
    `CapabilitiesResolution` | `getCapabilitiesResolution()` | Returns the capabilities resolution strategy.
    `ComponentSelectionRules` | `getComponentSelection()` | Returns the currently configured version selection rules object.
    `DependencySubstitutions` | `getDependencySubstitution()` | Returns the set of dependency substitution rules that are set for this configuration.
    `Set<ModuleVersionSelector>` | `getForcedModules()` | Returns currently configured forced modules.
    `void` | `preferProjectModules()` | Gradle can resolve conflicts purely by version number or prioritize project dependencies over binary.
    `ResolutionStrategy` | `setForcedModules​(Object... moduleVersionSelectorNotations)` | Allows forcing certain versions of dependencies, including transitive dependencies.
    `void` | `sortArtifacts​(ResolutionStrategy.SortOrder sortOrder)` | Specifies the ordering for resolved artifacts.

- - ### Method Detail

    - #### failOnVersionConflict

          ResolutionStrategy failOnVersionConflict()

      In case of conflict, Gradle by default uses the newest of conflicting versions. However, you can change this behavior. Use this method to configure the resolution to fail eagerly on any version conflict, e.g. multiple different versions of the same dependency (group and name are equal) in the same `Configuration`. The check includes both first level and transitive dependencies. See example below:

           plugins {
               id 'java' // so that there are some configurations
           }

           configurations.all {
             resolutionStrategy.failOnVersionConflict()
           }

      Returns:
        this resolution strategy instance
      Since:
        1.0-milestone-6

    - #### failOnDynamicVersions

          @Incubating
          ResolutionStrategy failOnDynamicVersions()

      If this method is called, Gradle will make sure that no dynamic version was used in the resulting dependency graph. In practice, it means that if the resolved dependency graph contains a module and that the versions participating in the selection of that module contain at least one dynamic version, then resolution will fail if the resolution result can change because of this version selector. This can be used in cases you want to make sure your build is reproducible, without relying on dependency locking.
      Returns:
        this resolution strategy
      Since:
        6.1

    - #### failOnChangingVersions

          @Incubating
          ResolutionStrategy failOnChangingVersions()

      If this method is called, Gradle will make sure that no changing version participates in resolution. This can be used in cases you want to make sure your build is reproducible, without relying on dependency locking.
      Returns:
        this resolution strategy
      Since:
        6.1

    - #### failOnNonReproducibleResolution

          @Incubating
          ResolutionStrategy failOnNonReproducibleResolution()

      Configures Gradle to fail the build is the resolution result is expected to be unstable, that is to say that it includes dynamic versions or changing versions and therefore the result may change depending on when the build is executed. This method is equivalent to calling both `failOnDynamicVersions()` and `failOnChangingVersions()`.
      Returns:
        this resolution strategy
      Since:
        6.1

    - #### preferProjectModules

          void preferProjectModules()

      Gradle can resolve conflicts purely by version number or prioritize project dependencies over binary. The default is by version number.

      This applies to both first level and transitive dependencies. See example below:

           plugins {
               id 'java' // so that there are some configurations
           }

           configurations.all {
             resolutionStrategy.preferProjectModules()
           }

      Since:
        3.2

    - #### activateDependencyLocking

          ResolutionStrategy activateDependencyLocking()

      Activates dependency locking support in Gradle. Once turned on on a configuration, resolution result can be saved and then reused for subsequent builds. This enables reproducible builds when using dynamic versions.
      Returns:
        this resolution strategy instance
      Since:
        4.8

    - #### deactivateDependencyLocking

          @Incubating
          ResolutionStrategy deactivateDependencyLocking()

      Deactivates dependency locking support in Gradle.
      Returns:
        this resolution strategy instance
      Since:
        6.0

    - #### disableDependencyVerification

          @Incubating
          ResolutionStrategy disableDependencyVerification()

      Deactivates dependency verification for this configuration. You should always be careful when disabling verification, and in particular avoid disabling it for verification of plugins, because a plugin could use this to disable verification itself.
      Since:
        6.2

    - #### enableDependencyVerification

          @Incubating
          ResolutionStrategy enableDependencyVerification()

      Enabled dependency verification for this configuration.
      Since:
        6.2

    - #### force

          ResolutionStrategy force​(Object... moduleVersionSelectorNotations)

      Allows forcing certain versions of dependencies, including transitive dependencies. Appends new forced modules to be considered when resolving dependencies.

      It accepts following notations:

      - String in a format of: 'group:name:version', for example: 'org.gradle:gradle-core:1.0'
      - instance of `ModuleVersionSelector`
      - any collection or array of above will be automatically flattened
      Example:

           plugins {
               id 'java' // so that there are some configurations
           }

           configurations.all {
             resolutionStrategy.force 'asm:asm-all:3.3.1', 'commons-io:commons-io:1.4'
           }

      Parameters:
        `moduleVersionSelectorNotations` - typically group:name:version notations to append
      Returns:
        this ResolutionStrategy instance
      Since:
        1.0-milestone-7

    - #### setForcedModules

          ResolutionStrategy setForcedModules​(Object... moduleVersionSelectorNotations)

      Allows forcing certain versions of dependencies, including transitive dependencies. Replaces existing forced modules with the input.

      For information on notations see `force(Object...)`

      Example:

           plugins {
               id 'java' // so that there are some configurations
           }

           configurations.all {
             resolutionStrategy.forcedModules = ['asm:asm-all:3.3.1', 'commons-io:commons-io:1.4']
           }

      Parameters:
        `moduleVersionSelectorNotations` - typically group:name:version notations to set
      Returns:
        this ResolutionStrategy instance
      Since:
        1.0-milestone-7

    - #### getForcedModules

          Set<ModuleVersionSelector> getForcedModules()

      Returns currently configured forced modules. For more information on forcing versions see `force(Object...)`
      Returns:
        forced modules
      Since:
        1.0-milestone-7

    - #### eachDependency

          ResolutionStrategy eachDependency​(Action<? super DependencyResolveDetails> rule)

      Adds a dependency substitution rule that is triggered for every dependency (including transitive) when the configuration is being resolved. The action receives an instance of `DependencyResolveDetails` that can be used to find out what dependency is being resolved and to influence the resolution process. Example:

           configurations {
             compileClasspath.resolutionStrategy {
               eachDependency { DependencyResolveDetails details ->
                 //specifying a fixed version for all libraries with 'org.gradle' group
                 if (details.requested.group == 'org.gradle') {
                   details.useVersion '1.4'
                 }
               }
               eachDependency { details ->
                 //multiple actions can be specified
                 if (details.requested.name == 'groovy-all') {
                    //changing the name:
                    details.useTarget group: details.requested.group, name: 'groovy', version: details.requested.version
                 }
               }
             }
           }

      The rules are evaluated in order they are declared. Rules are evaluated after forced modules are applied (see `force(Object...)`
      Returns:
        this
      Since:
        1.4

    - #### cacheDynamicVersionsFor

          void cacheDynamicVersionsFor​(int value,
                                       String units)

      Sets the length of time that dynamic versions will be cached, with units expressed as a String.

      A convenience method for `cacheDynamicVersionsFor(int, java.util.concurrent.TimeUnit)` with units expressed as a String. Units are resolved by calling the `valueOf(String)` method of `TimeUnit` with the upper-cased string value.

      Parameters:
        `value` - The number of time units
        `units` - The units
      Since:
        1.0-milestone-6

    - #### cacheDynamicVersionsFor

          void cacheDynamicVersionsFor​(int value,
                                       TimeUnit units)

      Sets the length of time that dynamic versions will be cached.

      Gradle keeps a cache of dynamic version => resolved version (ie 2.+ => 2.3). By default, these cached values are kept for 24 hours, after which the cached entry is expired and the dynamic version is resolved again.

      Use this method to provide a custom expiry time after which the cached value for any dynamic version will be expired.

      Parameters:
        `value` - The number of time units
        `units` - The units
      Since:
        1.0-milestone-6

    - #### cacheChangingModulesFor

          void cacheChangingModulesFor​(int value,
                                       String units)

      Sets the length of time that changing modules will be cached, with units expressed as a String.

      A convenience method for `cacheChangingModulesFor(int, java.util.concurrent.TimeUnit)` with units expressed as a String. Units are resolved by calling the `valueOf(String)` method of `TimeUnit` with the upper-cased string value.

      Parameters:
        `value` - The number of time units
        `units` - The units
      Since:
        1.0-milestone-6

    - #### cacheChangingModulesFor

          void cacheChangingModulesFor​(int value,
                                       TimeUnit units)

      Sets the length of time that changing modules will be cached.

      Gradle caches the contents and artifacts of changing modules. By default, these cached values are kept for 24 hours, after which the cached entry is expired and the module is resolved again.

      Use this method to provide a custom expiry time after which the cached entries for any changing module will be expired.

      Parameters:
        `value` - The number of time units
        `units` - The units
      Since:
        1.0-milestone-6

    - #### getComponentSelection

          ComponentSelectionRules getComponentSelection()

      Returns the currently configured version selection rules object.
      Returns:
        the version selection rules
      Since:
        2.2

    - #### componentSelection

          ResolutionStrategy componentSelection​(Action<? super ComponentSelectionRules> action)

      The componentSelection block provides rules to filter or blacklist certain components from appearing in the resolution result.
      Parameters:
        `action` - Action to be applied to the `ComponentSelectionRules`
      Returns:
        this ResolutionStrategy instance
      Since:
        2.2

    - #### getDependencySubstitution

          DependencySubstitutions getDependencySubstitution()

      Returns the set of dependency substitution rules that are set for this configuration.
      Since:
        2.5

    - #### dependencySubstitution

          ResolutionStrategy dependencySubstitution​(Action<? super DependencySubstitutions> action)

      Configures the set of dependency substitution rules for this configuration. The action receives an instance of `DependencySubstitutions` which can then be configured with substitution rules.

      Examples:

           // add dependency substitution rules
           configurations.all {
             resolutionStrategy.dependencySubstitution {
               // Substitute project and module dependencies
               substitute module('org.gradle:api') with project(':api')
               substitute project(':util') with module('org.gradle:util:3.0')

               // Substitute one module dependency for another
               substitute module('org.gradle:api:2.0') with module('org.gradle:api:2.1')
             }
           }

      Returns:
        this ResolutionStrategy instance
      Since:
        2.5
      See Also:
        `DependencySubstitutions`

    - #### sortArtifacts

          void sortArtifacts​(ResolutionStrategy.SortOrder sortOrder)

      Specifies the ordering for resolved artifacts. Options are:
      - `ResolutionStrategy.SortOrder.DEFAULT` : Don't specify the sort order. Gradle will provide artifacts in the default order.
      - `ResolutionStrategy.SortOrder.CONSUMER_FIRST` : Artifacts for a consuming component should appear before artifacts for its dependencies.
      - `ResolutionStrategy.SortOrder.DEPENDENCY_FIRST` : Artifacts for a consuming component should appear after artifacts for its dependencies.
      A best attempt will be made to sort artifacts according the supplied `ResolutionStrategy.SortOrder`, but no guarantees will be made in the presence of dependency cycles. NOTE: For a particular Gradle version, artifact ordering will be consistent. Multiple resolves for the same inputs will result in the same outputs in the same order.
      Since:
        3.5

    - #### capabilitiesResolution

          @Incubating
          ResolutionStrategy capabilitiesResolution​(Action<? super CapabilitiesResolution> action)

      Configures the capabilities resolution strategy.
      Parameters:
        `action` - the configuration action.
      Returns:
        this resolution strategy
      Since:
        5.6

    - #### getCapabilitiesResolution

          @Incubating
          CapabilitiesResolution getCapabilitiesResolution()

      Returns the capabilities resolution strategy.
      Since:
        5.6