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+/**
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+ * Licensed to the Apache Software Foundation (ASF) under one
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+ * or more contributor license agreements. See the NOTICE file
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+ * distributed with this work for additional information
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+ * regarding copyright ownership. The ASF licenses this file
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+ * to you under the Apache License, Version 2.0 (the
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+ * "License"); you may not use this file except in compliance
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+ * with the License. You may obtain a copy of the License at
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+ *
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+ * http://www.apache.org/licenses/LICENSE-2.0
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+ *
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+ * Unless required by applicable law or agreed to in writing, software
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+ * distributed under the License is distributed on an "AS IS" BASIS,
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+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+ * See the License for the specific language governing permissions and
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+ * limitations under the License.
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+ */
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+
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+package org.apache.hadoop.yarn.server.applicationhistoryservice;
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+
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+import java.util.Map;
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+
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+import org.apache.hadoop.classification.InterfaceAudience;
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+import org.apache.hadoop.classification.InterfaceStability;
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+import org.apache.hadoop.yarn.api.records.ApplicationAttemptId;
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+import org.apache.hadoop.yarn.api.records.ApplicationId;
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+import org.apache.hadoop.yarn.api.records.ContainerId;
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+import org.apache.hadoop.yarn.server.applicationhistoryservice.records.ApplicationAttemptHistoryData;
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+import org.apache.hadoop.yarn.server.applicationhistoryservice.records.ApplicationHistoryData;
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+import org.apache.hadoop.yarn.server.applicationhistoryservice.records.ContainerHistoryData;
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+
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+@InterfaceAudience.Public
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+@InterfaceStability.Unstable
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+public interface ApplicationHistoryReader {
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+
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+ /**
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+ * This method returns Application {@link ApplicationHistoryData} for the specified
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+ * {@link ApplicationId}.
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+ *
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+ * @return {@link ApplicationHistoryData} for the ApplicationId.
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+ */
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+ ApplicationHistoryData getApplication(ApplicationId appId);
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+
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+ /**
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+ * This method returns all Application {@link ApplicationHistoryData}s
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+ *
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+ * @return map {@link ApplicationId, @link ApplicationHistoryData}s.
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+ */
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+ Map<ApplicationId, ApplicationHistoryData> getAllApplications();
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+
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+ /**
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+ * Application can have multiple application attempts
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+ * {@link ApplicationAttemptHistoryData}. This method returns the all
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+ * {@link ApplicationAttemptHistoryData}s for the Application.
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+ *
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+ * @return all {@link ApplicationAttemptHistoryData}s for the Application.
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+ */
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+ Map<ApplicationAttemptId, ApplicationAttemptHistoryData> getApplicationAttempts(
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+ ApplicationId appId);
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+
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+ /**
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+ * This method returns {@link ApplicationAttemptHistoryData} for specified
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+ * {@link ApplicationId}.
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+ *
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+ * @param {@link ApplicationAttemptId}
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+ * @return {@link ApplicationAttemptHistoryData} for ApplicationAttemptId
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+ */
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+ ApplicationAttemptHistoryData getApplicationAttempt(
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+ ApplicationAttemptId appAttemptId);
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+
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+ /**
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+ * This method returns {@link Container} for specified {@link ContainerId}.
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+ *
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+ * @param {@link ContainerId}
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+ * @return {@link Container} for ContainerId
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+ */
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+ ContainerHistoryData getAMContainer(ContainerId containerId);
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+
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+ /**
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+ * This method returns {@link ContainerHistoryData} for specified
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+ * {@link ApplicationAttemptId}.
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+ *
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+ * @param {@link ApplicationAttemptId}
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+ * @return {@link ContainerHistoryData} for ApplicationAttemptId
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+ */
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+ ContainerHistoryData getContainer(ApplicationAttemptId appAttemptId);
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+}
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